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 ###Instrução: Qual raça possui uma Margem de 8?
 ###Tabelas: CREATE TABLE structures_past_or_present_600_m_and_taller_1969_ft (structures_past_or_present_600_m_and_taller_1969_ft_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Pinnacle height VARCHAR, Structure type VARCHAR, Main use VARCHAR, Town VARCHAR) CREATE TABLE race_record (race_record_id AUTO_INCREMENT PRIMARY KEY, Race VARCHAR, Dist (f) INT, Course VARCHAR, Class VARCHAR, Prize (£K) INT, Odds VARCHAR, Runners INT, Placing INT, Margin VARCHAR, Time VARCHAR, Jockey VARCHAR, Trainer VARCHAR) CREATE TABLE division_ii (division_ii_id AUTO_INCREMENT PRIMARY KEY, Institution VARCHAR, Location VARCHAR, Founded INT, Affiliation VARCHAR, Enrollment INT, Team Nickname VARCHAR, Primary conference VARCHAR) CREATE TABLE medallists_by_nation (medallists_by_nation_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Nation VARCHAR, Gold INT, Silver INT, Bronze INT, Total INT) CREATE TABLE nac_champions_and_runners_up (nac_champions_and_runners_up_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Winner VARCHAR, First Runner Up VARCHAR, Third Place VARCHAR, Consolation Winner/4th VARCHAR, Finals Location VARCHAR)  
SELECT Race FROM race_record WHERE Margin = 8